avoid palemoon bug on dragging a text selection;

"permission denied to access property preventDefault"

copyparty/web/up2k.js

@@ -1043,7 +1043,7 @@ function up2k_init(subtle) {
             clmod(ebi(v), 'hl', 1);
     }
     function offdrag(e) {
-        ev(e);
+        noope(e);
 
         var v = this.getAttribute('v');
         if (v)

copyparty/web/util.js

@@ -295,7 +295,7 @@ function ev(e) {
 
 
 function noope(e) {
-    ev(e);
+    try { ev(e); } catch (ex) { }
 }